A Chicago teen was charged with being part of an alleged gang rape shown on Facebook Live

A 14-year-old boy has been arrested and charged with sexual assault after allegedly being involved in a group sexual assault of Chicago teen that was broadcast on Facebook Live.

Police said late Saturday that 40 people saw the video without reporting it to authorities. At least five people were involved in the assault, Chicago police spokesman Anthony Guglielmi said.

ORIGINAL STORY: A 15-year-old Chicago girl who went missing Sunday afternoon has been found safe after her family says she was sexually assaulted by a handful of men on Facebook live, according to the Associated Press. Roughly 40 people who watched the live video reported the attack to police.

Anthony Guglielmi, the chief spokesman for the Chicago Police, confirmed that Deahvion Austin was found by officers.

LOCATED: Deahvion Austin was found by 10th district officers. She is now at the Area with her mother & detectives are conducting interviews. https://t.co/1UEAiL0JYn

Police learned of the attack after Austin's mother approached the police Superintendent Eddie Johnson late Monday afternoon as he was leaving a neighborhood on the city's West Side. She told him that her daughter had been missing since Sunday and showed him screen grabs of the attack.

Guglielmi said that Johnson subsequently ordered detectives to investigate and requested that Facebook to take down the video, which it did. He also said that Johnson was "visibly upset" after watching the video, pointing out the bystanders who failed to notify police.

The incident is the second in recent months in which an apparent attack was broadcasted on Facebook live. In January, four people were arrested after footage showed them allegedly taunting and beating a mentally disabled man.